HopStop.com
HopStop.com is a city transit guide site that features maps and directions from place to place using public transit, or a combination of public transit and walking. In addition, the site adds in a feature that we’re going to be seeing more and more of: local ads tailored to your route. It’s like Google’s Transit Trip Planner and, right now, New York is available as well as Boston and Washington, DC in beta versions.